The leki thermolite xl trekking poles are excellent walking poles that are incredibly sturdy and have the speed lock adjustment and an extra long and extremely comfortable thermo grip ideal for your next hiking adventure these leki poles have the speed lock 2 adjustment system so you can quickly and easily adjust the length of your pole even with your gloves on to suit your height the terrain and the gradient for best comfort and support the speed lock 2 system is smaller and lighter than others